In this article we explain how to hide your number using *67 when calling from a smartphone.
How to Block Your Number When Calling on ANDROID – Hide Caller ID
To prevent your number from appearing on a recipient's phone, press *67 followed by the number you want to call. For example, *675555555555.
This works even if the other person already has your number in their phone. Instead of displaying your number, the recipient will see a message like "Restricted", "Blocked" or "Private Number".
You can also use the settings in the Phone app to hide your number when using an Android phone:
